Controllable throttle for a vacuum pump

US4803845A · kind A · utility

Assignee

• Leybold GmBH · DE

Inventors

• Wilhelm Strasser · Bensberg, DE
• Axel Veit · Pulheim, DE

Key dates

• Filing date: Jan 26, 1988
• Grant date: Feb 14, 1989
• Expiry date: Jan 26, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/87507
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A throttle valve with a separate flange, usable with a vacuum pump defining an inlet opening, and a controllable throttle assembly for varying a flow passage cross section of the inlet opening. The throttle assembly is disposed in the inlet opening and has a plurality of slats rotatable about respective longitudinal axes for varying their inclination and an actuating rod for turning the slats. The flange has a throughgoing bore through which the actuating rod passes. The slats have a substantially constant width and their longitudinal axes are oriented parallel to one another. The slats form a first and a second slat group, and a linkage connects the slats with one another for turning the slats of the first slat group and the slats of the second slat group in opposite directions. A chamber is situated externally of the inlet opening and communicates with the throughgoing bore. A pivotal lever articulated to the actuating rod is situated in the chamber and projects outwardly therefrom. There is further provided a swingable bellows supported in the chamber and surrounding the pivotal lever for providing an airtight separation of at least one part of the pivotal lever from the chamber…